as far as china's announcement of an air defense identification zone over disputed territory between china and japan. well, last week, the united states got involved flying unarmed b-52 bombers over the area along with several japanese surveillance planes. the chinese responded by scrambling fighter jets. vice president biden hopes to not only defuse tensions but also reaffirm america's commitment to the region. anna coren, cnn, tokyo. >> here's a look how biden's week is set to play out. tomorrow in japan, he'll meet with the prime minister there. then on wednesday the vice president heads to china where he is expected to discuss the air space dispute and then on thursday, biden travels to south korea where he will be briefed on the nuclear situation with north korea. then the haven't heads home. so yes, a pretty busy week. >> a lot to talk about, too. boy, well a ray of hope for a pair of americans being held captive in north korea. a look at a new call free the men, plus we're going to hear from the sister of one of those being held who was sentenced for 15 years hard labor. we'll